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Zorluk: KolayMultimeter: Voltage and Current Measurement

An electronics technician needs to safely measure the direct current flowing through a resistor in a DC circuit using a digital multimeter. What is the correct sequence of steps to perform this measurement?

  1. 1De-energize the circuit by turning off or disconnecting the DC power source.
  2. 2Set the multimeter selector dial to DC current (DCA\text{DCA}) and plug the red test lead into the current input jack.
  3. 3Open or break the circuit at the point where current needs to be measured.
  4. 4Connect the multimeter test probes in series across the open break and reapply power to read the current.

Cevap

De-energize the power source →\rightarrow Configure the multimeter dial and leads for DC current →\rightarrow Break the circuit at the test point →\rightarrow Connect the meter in series across the break and restore power.
To measure current safely and accurately, power must first be disconnected. The meter is then configured for DC current (DCA\text{DCA}) with the red lead placed in the current jack. Next, the circuit is physically opened at the test point. Finally, the meter probes are inserted in series across the open break and power is restored to take the measurement.

Adım Adım Çözüm

1
De-energize the circuit power supply.
Voltage and current in the circuit drop to zero.
Eliminates shock hazard and prevents accidental short circuits when modifying wiring.
2
Select the DC current (DCA\text{DCA}) function and insert the red probe into the appropriate ampere/milliampere jack.
The multimeter's internal shunt resistor and sensing circuitry are engaged.
Current measurements require a low-resistance path through the designated current terminal.
3
Disconnect a lead or component leg to create an open break in the circuit path.
A single physical break is created where total branch current must pass.
An ammeter must be inserted into the conductive path rather than placed across a component.
4
Attach the meter leads in series across the break, turn on power, and observe the reading.
Current flows through the meter, displaying the measurement.
In a series connection, the full current of that path passes through the meter for accurate measurement.

Anahtar Kavram

Current measurement requires inserting the multimeter in series with the circuit path after de-energizing the circuit and configuring the meter for DC current.
Tahmini Süre:45s
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Multimeter: Voltage and Current Measurement

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